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Loading contentCopernicus's masterwork, 'On the Revolutions of the Heavenly Spheres', setting out the heliocentric system in full. Published in the year of his death, it began the displacement of the Earth from the centre of the cosmos.
Facts on this topic will be cited from these primary and reference sources.
General reference for the history of astronomy, biographies, and cultural context.
Official naming, definitions, constellation boundaries, and astronomical nomenclature.